Subscriber transmission system

Abstract

The arrangement is such that to a transmission apparatus of the subscriber side in a subscriber transmission system wherein the transmission apparatus of the subscriber side which serves a plurality of subscribers and a transmission apparatus connected to a switching system are connected to each other via multiplexed transmission lines, there are provided memories to store originating and terminating call signals, and a controller not only to control so that only subscriber transmitter-receivers corresponding to a specific number of subscribers in the subscriber transmitter-receivers for transmitting and receiving signals of subscribers enter an operating state, but also to cause the memories to operate, so that electric power is supplied only to circuits corresponding to a specific number of subscribers in the transmission apparatus of the subscriber side by controlling through the controller when the rate of telephone use is low.

I claim: 
     
       1. In a subscriber transmission system having: a transmission apparatus of a subscriber side including a subscriber transmitter-receiver provided according to a plurality of subscribers with circuits for transmitting and receiving signals of subscriber lines, a subscriber side signal multiplexer-demultiplexer for multiplexing and demultiplexing transmitted and received signals of said subscriber transmitter-receiver, and a transmission signal transmitter-receiver for transmitting and receiving signals, which said subscriber side signal multiplexer-demultiplexer multiplexes and demultiplexes, and   a transmission apparatus of a switching system side including a subscriber transmitter-receiver provided according to a plurality of subscribers with circuits for transmitting and receiving signals to and from a switching system, a switching system side signal multiplexer-demultiplexer for multiplexing and demultiplexing transmitted and received signals of said subscriber transmitter-receiver, and a transmission signal transmitter-receiver for transmitting and receiving signals, which said switching system side signal multiplexer-demultiplexer multiplexes and demultiplexes,   wherein said transmission apparatus of the subscriber side and said transmission apparatus of the switching system side are interconnected via transmission lines, an improvement of the subscriber side comprising:   a memory for temporarily storing call signals originating from said subscriber transmitter-receiver, a memory for temporarily storing call signals terminating in said subscriber transmitter-receiver and a controller for causing only a specific number of subscriber transmitter-receivers corresponding to a specific number of subscribers to be in an operating state and causing said memories to operate,   electric power being supplied only to circuits which correspond to said specific number of subscribers in said transmission apparatus of the subscriber side.   
     
     
       2. A subscriber transmission system as defined in claim 1 wherein said controller includes: a service shift switch for shifting the setting of subscriber transmitter-receivers corresponding to said specific number of subscribers in response to external control information, a phase adjuster for controlling the operating phase in said memories in response to a shift of said service shift switch, a timing controller for controlling the timing of write and read in said memories in response to phase adjustment from the phase adjuster, and a transmitter-receiver shift commander for issuing shift commands for setting said subscriber transmitter-receivers corresponding to said specific number of subscribers in the subscriber transmitter-receivers in response to a shift of said service shift switch. 
     
     
       3. A subscriber transmission system as defined in claim 2 wherein said control information for said service shift switch is transmitted from the transmission apparatus of the switching system side by means of a multiplexed signal, and demultiplexed by a signal multiplexer-demultiplexer in the transmission apparatus of the subscriber side to be given to said controller. 
     
     
       4. A subscriber transmission system as defined in claim 1, wherein said transmission apparatus of the switching system side is provided with a controller for generating control information to cause only said subscriber transmitter-receivers corresponding to a specific number of subscribers to be in an operating state and to cause said memories to operate, said control information being transmitted from said transmission apparatus, and in said transmission apparatus of the subscriber side, said each control is performed on the basis of said control information separated in a signal multiplexer-demultiplexer. 
     
     
       5. A subscriber transmission system as defined in claim 1, wherein there is provided an electric power feeding controller for controlling so that DC power source is supplied from a battery at a time of stoppage of a commercial power supply in an AC/DC converter for supplying DC power causing said transmission apparatus of the subscriber side to operate, and when said battery power is supplied, said controller sets only said subscriber transmitter-receivers corresponding to a specific number of subscribers in an operating state and causes said memories to operate. 
     
     
       6. A subscriber transmission system as defined in claim 5 wherein said electric power feeding controller has a power source monitor for detecting the stoppage of DC power supplied from said AC/DC converter, a battery changer for supplying DC power source from the battery in response to said detection of the stoppage of DC power, an electric power distributor for distributing DC power from said AC/DC converter or DC power source from said battery changer to within said transmission apparatus, and a power source changer responsive to control information from outside for stopping, in said power source monitor, DC power supplied from said AC/DC converter, in said battery changer for supplying DC power source from said battery, in said electric power distributor for distributing DC power source from said battery changer to within said transmission apparatus. 
     
     
       7. A subscriber transmission system as defined in claim 6 wherein the control information for said power source changer is transmitted from the transmission apparatus of the switching system side by means of a multiplexed signal, and demultiplexed by a signal multiplexer-demultiplexer in the transmission apparatus of the subscriber side to be given to said electric power feeding controller. 
     
     
       8. A subscriber transmission system wherein a transmission apparatus of a subscriber side servicing a plurality of subscribers, and a transmission apparatus connected to a switching system, are interconnected via multiplexed transmission lines, said transmission apparatus of the subscriber side, comprising: subscriber transmitter-receivers for transmitting and receiving signals of subscriber lines;   memories for storing originating and terminating call signals respectively;   a controller for causing only a specific number of said subscriber transmitter receivers to be in an operating state, for causing said memories to operate, and for supplying electric power from a source only to circuits corresponding to said specific number of subscribers in said transmission apparatus of said subscriber side.   
     
     
       9. A subscriber transmission system as defined in claim 8 wherein said controller includes: a service shift switch for shifting the setting of subscriber transmitter-receivers corresponding to a specific number of subscribers in response to external control information, a phase adjuster for controlling the operating phase in said memories in response to a shift of said service shift switch, a timing controller for controlling the timing of write and read in said memories in response to phase adjustment from the phase adjuster, and a transmitter-receiver shift commander for issuing shift commands for setting said subscriber transmitter-receivers corresponding to said specific number of subscribers in the subscriber transmitter-receivers in response to a shift of said service shift switch. 
     
     
       10. A subscriber transmission system as defined in claim 9 wherein said control information for said service shift switch is transmitted from the transmission apparatus of the switching system side by means of a multiplexed signal, and demultiplexed by a signal multiplexer-demultiplexer in the transmission apparatus of the subscriber side to be given to said controller. 
     
     
       11. A subscriber transmission system as defined in claim 1, wherein said transmission apparatus of the switching system side is provided with a controller for generating control information to cause only said subscriber transmitter-receivers corresponding to a specific number of subscribers to be in an operating state and to cause said memories to operate, said control information being transmitted from said transmission apparatus, and in said transmission apparatus of the subscriber side, said each control is performed on the basis of said control information separated in a signal multiplexer-demultiplexer. 
     
     
       12. A subscriber transmission system as defined in claim 8, wherein there is provided an electric power feeding controller for controlling so that DC power source is supplied from a battery at a time of stoppage of a commercial power supply in an AC/DC converter for supplying DC power causing said transmission apparatus of the subscriber side to operate, and when said battery power is supplied, said controller sets only said subscriber transmitter-receivers corresponding to a specific number of subscribers in an operating state and causes said memories to operate. 
     
     
       13. A subscriber transmission system as defined in claim 12 wherein said electric power feeding controller has a power source monitor for detecting the stoppage of DC power supplied from said AC/DC converter, a battery changer for supplying DC power source from the battery in response to said detection of the stoppage of DC power, an electric power distributor for distributing DC power from said AC/DC converter or DC power source from said battery changer to within said transmission apparatus, and a power source changer responsive to control information from outside for stopping, in said power source monitor, DC power supplied from said AC/DC converter, in said battery changer for supplying DC power source from said battery, in said electric power distributor for distributing DC power source from said battery changer to within said transmission apparatus. 
     
     
       14. A subscriber transmission system as defined in claim 12 wherein the control information for said power source changer is transmitted from the transmission apparatus of the switching system side by means of a multiplexed signal, and demultiplexed by a signal multiplexer-demultiplexer in the transmission apparatus of the subscriber side to be given to said electric power feeding controller.